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How to Unlock a Chevy Radio
Step 1: Start the vehicle and turn on the radio.
Step 2: Press and hold preset numbers 2 and 3 until a three digit code appears on the radio display. Write this code down.
Step 3: Press the AM/FM button. Your radio will display a second three digit code. Write the second code down. You will now have a six digit code.
Step 4: Call the Chevy Radio Code phone line at 1-800-537-5140.
Step 4: Enter 106010 followed by the # key to direct you to the radio code retrieval system.
Step 5: Enter the six digit code you retrieved in steps 2 and 3 followed by the * key. They must be in order. You will be given a four digit radio code. Write down the radio code.
Step 6: Start your vehicle and turn on the radio. Using the Minute and Hour buttons, enter in the four digit radio code to your stereo system. Press the AM/FM button to unlock your stereo.
How to Unlock a GM Radio
Step 1: Start the vehicle and turn on the radio. The radio will display "LOC" indicating the Theftlock system is activated.
Step 2: Press and hold preset buttons 1 and 4 for ten seconds. (If you don't have a fourth preset button, press and hold presets 2 and 3.) The radio will display a three digit number. Write this number down.
Step 3: Press the AM/FM button. Your radio will display a second three digit code. Write the second code down. You will now have a six digit code.
Step 4: Contact your local GM Dealer and give them the six digit code. They will give you a four digit radio code.
Many dealers will give you your radio code for free, while others may charge a small fee. If your dealer is charging a larger fee, consider calling another dealer or doing a Google search for sites offering GMC Radio codes. They usually charge a small (around $10) fee.
Step 5: Start your vehicle and turn on the radio. Press the Hour button on the radio until the first two number of the code appear. Next, press the Minute button until the last two numbers of the code are displayed. Once all four digits appear, press the AM/FM button to unlock your stereo. The display will read "SEC" indicating you have successfully unlocked your radio and it is fully operational.
If radio display reads "INOP" while the vehicle is on, too many incorrect radio codes have been entered. To remove "INOP" from your display and unlock your radio, you must leave the key in the On position for one hour. Once you've retrieved your radio unlock code, write it down for future use. Your radio code will not change and having it handy will save from going from the radio code retrieval process again.

Try this:
How to Unlock a Chevy Radio
Step 1: Start the vehicle and turn on the radio.
Step 2: Press and hold preset numbers 2 and 3 until a three digit code appears on the radio display. Write this code down.
Step 3: Press the AM/FM button. Your radio will display a second three digit code. Write the second code down. You will now have a six digit code.
Step 4: Call the Chevy Radio Code phone line at 1-800-537-5140.
Step 4: Enter 106010 followed by the # key to direct you to the radio code retrieval system.
Step 5: Enter the six digit code you retrieved in steps 2 and 3 followed by the * key. They must be in order. You will be given a four digit radio code. Write down the radio code.
Step 6: Start your vehicle and turn on the radio. Using the Minute and Hour buttons, enter in the four digit radio code to your stereo system. Press the AM/FM button to unlock your stereo.
How to Unlock a GM Radio
Step 1: Start the vehicle and turn on the radio. The radio will display "LOC" indicating the Theftlock system is activated.
Step 2: Press and hold preset buttons 1 and 4 for ten seconds. (If you don't have a fourth preset button, press and hold presets 2 and 3.) The radio will display a three digit number. Write this number down.
Step 3: Press the AM/FM button. Your radio will display a second three digit code. Write the second code down. You will now have a six digit code.
Step 4: Contact your local GM Dealer and give them the six digit code. They will give you a four digit radio code.
Many dealers will give you your radio code for free, while others may charge a small fee. If your dealer is charging a larger fee, consider calling another dealer or doing a Google search for sites offering GMC Radio codes. They usually charge a small (around $10) fee.
Step 5: Start your vehicle and turn on the radio. Press the Hour button on the radio until the first two number of the code appear. Next, press the Minute button until the last two numbers of the code are displayed. Once all four digits appear, press the AM/FM button to unlock your stereo. The display will read "SEC" indicating you have successfully unlocked your radio and it is fully operational.
If radio display reads "INOP" while the vehicle is on, too many incorrect radio codes have been entered. To remove "INOP" from your display and unlock your radio, you must leave the key in the On position for one hour. Once you've retrieved your radio unlock code, write it down for future use. Your radio code will not change and having it handy will save from going from the radio code retrieval process again.

If you know the code that was used to lock the radio then use the following instructions from the owner's manual to unlock the radio.Quote:Enter your secret code as follows; pause no more than 15 seconds between steps:1. Turn the ignition on. LOC will appear on the display.2. Press MIN and 000 will appear on the display.3. Press MIN again until the last two digits agree with your code.4. Press HR until the first one or two digits agree with your code.5. Press AM-FM after you have confirmed that the code matches your secret code. The display will show SEC, indicating the radio is now operable and secure.

If you enter the wrong code eight times, INOP will appear on the display. You will have to wait an hour with the ignition on before you can try again. When you try again, you will only have three more chances (eight tries per chance) to enter the correct code before INOP appears. If you don't know the code that was used to lock the radio then you will have to use the dealer's unlock procedure as follows. The dealer code changes over time - the one listed is current as of this posting. If it doesn't work try 08359 or search the forum for messages with a more recent code.Quote:1. Press and hold presets 2 & 3 for about 10 seconds until the first three digits of the display code are displayed.2. Write the numbers down. 3. Press the AM-FM button, write down the next three numbers.4. Call 1-800-537-5140. When asked, enter dealer code 202108, press the * button, and enter the six digit code from the radio. You will get an unlock code, write it down. 5. Go back to the car, press the HR button and set the first two numbers, press the MIN button and set the next two numbers, then press the AM-FM button. The display will show SEC, indicating the radio is now operable and secure.

To remove the code, repeat step 5. you should see --- on the radio face indicating the code is now out of the radio."

electrics ?' too clever for me as this is a ploy to make work for a dealer only ,check the brake fluid level ,then the front brake pads ,but if it needs new pads then its dealer only job as the ABS will not allow the pistons to go back in ,and if you slacken the bleed nipples to allow the fluid to escape so pistons go back in then the factory immobilisor comes on .kippered every which way ,

this light is triggered only by miles. you will probably need to go to the dealer to reset this light. in the meantime try this: 1. Turn the key to the "ACC" position which is the notch that allows power but doesn't turn the engine. 2. The display will read change engine oil soon - hit the display button(i) and the display will read 0% oil life. 3. Hit reset button (the check mark button) for 5 seconds and the display will change to 100 % oil life. 4. It may not work the 1st,2nd,3rd .... attempt , but will work eventually.

To reset the
message displays, turn the ignition switch on. Press and hold the
odometer reset button “A” located below the speedometer. Turn off
the ignition while holding the button. “OEL” will display on the
indicator. Press and hold the lower digital clock reset button or
the analog clock reset button “B” until five dashes appear in the
display.If needed, next
press the odometer reset button until IN 01 is displayed and then
press the clock reset button until five dashes appear. If needed,
next press the odometer reset button until IN 02 is displayed and
then press the clock reset button until five dashes appear.To exit reset
mode, turn ignition switch on and when IN 01 appears, turn ignition
off.